#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>

// ====== WiFi Configuration ======
const char* ssid = "Wokwi-GUEST";  // Simulated WiFi SSID
const char* password = "";  // Simulated WiFi password
const char* auth_token = "BHvR9FAxZW-JJnJDpnai5bbBod5qesUm";  // Your Blynk authentication token

// ====== Weather API Configuration ======
const char* apiKey = "72921b57d598a73428417b4ddb8904e9";  // OpenWeather API Key
const char* city = "Surakarta";  // City
const char* country = "ID";  // Country code (Indonesia)

// ====== Pin Configuration ======
#define SOIL_SENSOR_PIN 34  // Soil moisture sensor pin
#define RELAY_PIN 26        // Relay pin for water pump

// ====== Global Variables ======
int soilMoisture = 0;  // Variable to store soil moisture value
bool isRaining = false;  // Weather status from API
bool manualPump = false; // Manual control status for the pump

// ====== Function to send data to Blynk (POST) ======


void sendToBlynk(String virtualPin, String value) {
  HTTPClient http;
  
  // Create URL for Blynk API
  String url = "https://blynk.cloud/external/api/update?token=" + String(auth_token) + "&V" + String(virtualPin) + "=" + String(value);

  // Begin HTTP request
  http.begin(url);

  // Set headers to match curl
  http.addHeader("User-Agent", "curl/7.64.1");
  http.addHeader("Accept", "application/json");   // Expect JSON response
  http.addHeader("Connection", "keep-alive");    // Maintain connection
  // Send GET request
  int httpResponseCode = http.GET();
  

  // Check response code s
  if (httpResponseCode == 200) {
    Serial.println("Data sent to Blynk successfully");
  } else {
    Serial.println("Failed to send data to Blynk");
  }
  
  http.end();  // Close the connection
}

// ====== Function to read soil moisture sensor ======
void readSoilSensor() {
  soilMoisture = analogRead(SOIL_SENSOR_PIN);
  Serial.print("Soil Moisture: ");
  Serial.println(soilMoisture);

  sendToBlynk("V8", String(soilMoisture)); // Send data to Virtual Pin V4
}



// ====== Function to get weather data from API ======
void getWeatherData() {
  HTTPClient http;
  String url = "http://api.openweathermap.org/data/2.5/weather?q=" + String(city) + "," + String(country) + "&appid=" + String(apiKey) + "&units=metric";

  http.begin(url);
  int httpResponseCode = http.GET();

  if (httpResponseCode > 0) {
    String payload = http.getString();
    Serial.println("Weather Data: " + payload);

    DynamicJsonDocument doc(1024);
    deserializeJson(doc, payload);

    // Extract rain volume
    float rainVolume = doc["rain"]["1h"].as<float>();  // Directly cast rain volume as float
    isRaining = (rainVolume > 0);  // If rain volume is greater than 0, it's raining

    Serial.print("Rain Volume: ");
    Serial.println(rainVolume);
    Serial.print("Is it raining? ");
    Serial.println(isRaining ? "Yes" : "No");

    sendToBlynk("V5", String(rainVolume)); // Send rain data to Virtual Pin V5
  } else {
    Serial.println("Failed to get weather data!");
  }

  http.end();
}

// ====== Function to check watering logic ======
void checkWatering() {
  if (manualPump) {
    digitalWrite(RELAY_PIN, HIGH);
  } else {
    if (isRaining) {
      digitalWrite(RELAY_PIN, LOW);
      Serial.println("Rain detected, pump off.");
    } else if (soilMoisture > 2500) {
      digitalWrite(RELAY_PIN, HIGH);
      Serial.println("Soil is dry, pump on.");
    } else {
      digitalWrite(RELAY_PIN, LOW);
      Serial.println("Soil is moist, pump off.");
    }
  }

  sendToBlynk("V6", String(digitalRead(RELAY_PIN))); // Send pump status to Virtual Pin V6
}

// ====== Function to check Blynk Online Status ======
void checkBlynkStatus() {
  HTTPClient http;
  //String url = "http://sgp1.blynk.cloud/external/api/isHardwareConnected?token=" + String(auth_token);
  String url = "https://blynk.cloud/external/api/get?token="+ String(auth_token);
  http.begin(url);
  int httpResponseCode = http.GET();

  if (httpResponseCode == 200) {
    Serial.println("✅ Blynk is ONLINE");
  } else {
    Serial.println("❌ Blynk is OFFLINE");
  }

  http.end();
}

// ====== Setup ======
void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);

  pinMode(SOIL_SENSOR_PIN, INPUT);
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW);

  Serial.println("Connecting to WiFi...");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\n✅ Connected to WiFi!");
}

// ====== Loop ======
void loop() {
  checkBlynkStatus();  // Check if Blynk is online
  readSoilSensor();    // Read soil moisture
  getWeatherData();    // Get weather data from API
  checkWatering();     // Check if watering is needed
  delay(30000);        // Update every 30 seconds
}